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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "child-handler.h"
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <vespa/log/log.h>
LOG_SETUP(".child-handler");
ChildHandler::ChildHandler() : _childRunning(false) {}
namespace {
void
runSplunk(const vespalib::string &prefix, const char *a1, const char *a2 = 0)
{
const char *argv[] = { 0, a1, a2, 0 };
vespalib::string path = prefix + "/bin/splunk";
argv[0] = path.c_str();
LOG(debug, "starting splunk forwarder with command: '%s' '%s' '%s'",
argv[0], argv[1], argv[2]);
fflush(stdout);
pid_t child = fork();
if (child == -1) {
perror("fork()");
return;
}
if (child == 0) {
vespalib::string env = "SPLUNK_HOME=" + prefix;
char *cenv = const_cast<char *>(env.c_str()); // safe cast
putenv(cenv);
LOG(debug, "added to environment: '%s'", cenv);
char **cargv = const_cast<char **>(argv); // safe cast
execv(argv[0], cargv);
// if execv fails:
perror(argv[0]);
exit(1);
}
LOG(debug, "child running with pid %d", (int)child);
int waitStatus = 0;
if (waitpid(child, &waitStatus, 0) == -1) {
perror("waitpid()");
return;
}
if (WIFEXITED(waitStatus) && WEXITSTATUS(waitStatus) == 0) {
// all OK
LOG(debug, "child ran ok, exit status 0");
return;
}
if (WIFEXITED(waitStatus)) {
LOG(warning, "failed starting splunk forwarder (exit status %d)",
WEXITSTATUS(waitStatus));
} else if (WIFSIGNALED(waitStatus)) {
LOG(warning, "failed starting splunk forwarder (exit on signal %d)",
WTERMSIG(waitStatus));
} else {
LOG(warning, "failed starting splunk forwarder (abnormal exit status %d)",
waitStatus);
}
}
} // namespace <unnamed>
void
ChildHandler::startChild(const vespalib::string &prefix)
{
if (! _childRunning) {
runSplunk(prefix, "start", "--accept-license");
_childRunning = true;
// it is possible that splunk was already running, and
// then the above won't do anything, so we need to
// *also* do the restart below, after a small delay.
sleep(1);
}
runSplunk(prefix, "restart");
}
void
ChildHandler::stopChild(const vespalib::string &prefix)
{
runSplunk(prefix, "stop");
_childRunning = false;
}
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